Deprecate favorite_actions(), add_contextual_help(), add_screen_option(), move...

Deprecate favorite_actions(), add_contextual_help(), add_screen_option(), move meta_box_prefs() and get_screen_icon() in WP_Screen, see #18690

git-svn-id: https://core.svn.wordpress.org/trunk@18874 1a063a9b-81f0-0310-95a4-ce76da25c4cd